เว็บบอดแสดงความคิดเหนไม่ได้ รบกวนพี่ๆ ช่วยชี้แนะหน่อยนะค่ะ เหมือนว่าไม่มีค่า idquestion ส่งมาอะค่ะ

<div align="center">
  <p><br>
    <?
	include('connectDB.php');
	mysql_query ("SET NAMES utf8") or die (mysql_errno());
	$sql = "select * from quiz where IDQuestion=$idquestion";
	echo $sql.'<br>';
	$dbquery = mysql_db_query($db, $sql);
	$result = mysql_fetch_array($dbquery);
	$idquestion = $result[IDQuestion];
	$title = $result[Title];
	$name = $result[Name];
	$message = $result[Message];
	$email = $result[Email];
	$dateq = $result[DateQ];
print "<table width=650 border=1 align=center cellpadding=1 cellspacing=1 bordercolor=0000FF>";
	print "<tr>";
		print "<td width=703>";
			print "<table width=650 align=center>";
					print "<tr bgcolor=B05B08>";
						print "<td width=97><font color=FFFFFF><b>หัวข้อกระทู้</b></font></td>";
						print "<td width=417><font color=FFFFFF><b>".$title."</font></b></td>";
					print "</tr>";
					print "<tr bgcolor=D3BC38>";
						print "<td width=97><b>รายละเอียด</b></td>";
						print "<td width=417>".$message."</td>";
					print "</tr>";
					print "<tr bgcolor=D3BC38>";
						print "<td width=97><b>ผู้ตั้งกระทู้</b></td>";
						print "<td width=417>".$name."</td>";
					print "</tr>";
			print "</table>";
		print"</td>";
	print"</tr>";
print"</table>";	
mysql_query ("SET NAMES utf8") or die (mysql_errno());
$sql = "select * from ans where IDQuestion=$idquestion order by idans";
echo $sql.'<br>';
$dbquery = mysql_db_query($db, $sql);
$num_rows = mysql_num_rows($dbquery);
if($num_rows==''){
print "ยังไม่มีผู้แสดงความคิดเห็น";
}
$i=0;
while ($i < $num_rows)
{
	$result = mysql_fetch_array($dbquery);
	$idans = $result[IDAns];
	$idquestion = $result[IDQuestion];
	$name = $result[Name];
	$message = $result[Message];
	$email = $result[Email];
	$datea = $result[DateA];
	$n++;
print"<br>";
print "<table width=650 border=1 align=center cellpadding=1 cellspacing=1 bordercolor=0000FF>";
	print "<tr>";
		print "<td width=703>";
			print "<table width=650 align=center>";
					print "<tr bgcolor=999999 ><div align=center><b>ความคิดเห็นที่ $n</b></div></tr>";
					print "<tr bgcolor=D3BC38>";
						print "<td width=97><b>รายละเอียด</b></td>";
						print "<td width=417>".$message."</td>";
					print "</tr>";
					print "<tr bgcolor=D3BC38>";
						print "<td width=97><b>จากคุณ</b></td>";
						print "<td width=417>".$name."</td>";
					print "</tr>";
			print "</table>";
		print"</td>";
	print"</tr>";
print"</table>";	
$i++;
}
mysql_close();
?>
    </p>
</div>
<form name="form1" method="post" action="Reply.php">
  <table width="650" border="1" align="center" cellpadding="1" cellspacing="1" bordercolor="#0000FF">
    <tr>
      <td width="703"><table width="651" border="0" align="center" cellspacing="1">
        <tr>
          	<td colspan="2" bgcolor="#B05B08"><div align="center" class="style1"><u>แสดงความคิดเห็น</u></div></td>
        </tr>
        <tr>
          	<td width="97" bgcolor="#D3BC38">ชื่อผู้ตอบ :</td>
          	<td width="417" bgcolor="#D3BC38"><input name="name" type="text" id="name" size="65"></td>
        </tr>
        <tr>
          	<td bgcolor="#D3BC38">รายละเอียด :</td>
          	<td bgcolor="#D3BC38"><textarea name="message" cols="65" rows="7" wrap="VIRTUAL" id="message">
		  	</textarea></td>
        </tr>
        <tr>
          	<td bgcolor="#D3BC38"> อีเมล์ :</td>
          	<td bgcolor="#D3BC38"><input name="email" type="text" id="email" size="30"></td>
        </tr>
        <tr>    
          	<td bgcolor="#D3BC38">&nbsp;</td>
          	<td bgcolor="#D3BC38"><input type="submit" name="Submit" value="แสดงความคิดเห็น">
              <input type="reset" name="Submit2" value="ยกเลิก"></td>
       <input type="hidden" name="idquestion" value="<? echo $idquestion;?>"> 
	   </tr>
      </table></td>
    </tr>
  </table>
</form>
<div align="center">
  <p>&nbsp;</p>
  <p>[<a href="Webboard.php">กลับหน้าจอ เว็บบอร์ด</a>]
  </p>
</div>